Adsorbent materials and methods of adsorbing carbon dioxide

Abstract

Methods of designing zeolite materials for adsorption of CO 2 . Zeolite materials and processes for CO 2 adsorption using zeolite materials.

What is claimed is: 
     
       1. A pressure swing adsorption process for separating CO 2  from a feed gas mixture, wherein the process comprises:
 a) subjecting the feed gas mixture comprising CO 2  to an adsorption step by introducing the feed gas mixture into a feed input end of an adsorbent bed, wherein the adsorbent bed comprises: 
 a feed input end and a product output end; and 
 an adsorbent material selective for adsorbing CO 2 , wherein the adsorbent material comprises a zeolite having a Si/Al ratio of between about 5 and about 45 and with a framework structure selected from the group consisting of CHA, FER, LTA, RHO, UFI, and a combination thereof; 
 wherein the adsorbent bed is operated at a first pressure and at a first temperature wherein at least a portion of the CO 2  in the feed gas mixture is adsorbed by the adsorbent bed and wherein a gaseous product depleted in CO 2  exits the product output end of the adsorbent bed; 
 b) stopping the introduction of the feed gas mixture to the adsorbent bed before breakthrough of CO 2  from the product output end of the adsorbent bed; 
 c) reducing the pressure in the adsorbent bed to a second pressure resulting in desorption of at least a portion of CO 2  from the adsorbent bed; and 
 d) recovering at least a portion of CO 2  from the adsorbent bed. 
 
     
     
       2. The pressure swing adsorption process of  claim 1 , wherein the first temperature is from about −20° C. to about 80° C. and the first pressure is such that the partial pressure of CO 2  is from about 3 bar to about 25 bar. 
     
     
       3. The pressure swing adsorption process of  claim 1 , wherein the first temperature is from about 0° C. to about 50° C. and the first pressure is such that the partial pressure of CO 2  is from about 3 bar to about 10 bar. 
     
     
       4. The pressure swing adsorption process of  claim 1 , wherein the first temperature is from about 0° C. to about 50° C. and the first pressure is such that the partial pressure of CO 2  is from about 15 bar to about 25 bar. 
     
     
       5. The pressure swing adsorption process of  claim 1 , wherein the second pressure is such that the partial pressure of CO 2  is from about 0.1 bar to about 10 bar. 
     
     
       6. The pressure swing adsorption process of  claim 1 , wherein the feed gas mixture comprises a natural gas stream. 
     
     
       7. The pressure swing adsorption process of  claim 1 , wherein the zeolite comprises a cation concentration of less than about 10%. 
     
     
       8. The pressure swing adsorption process of  claim 1 , wherein the adsorbent material has a working capacity of about 3.0 mmol/cc to about 17.0 mmol/cc. 
     
     
       9. The pressure swing adsorption process of  claim 1 , wherein the adsorbent bed comprises one or more open flow channels throughout its entire length through which the feed gas mixture is passed. 
     
     
       10. The pressure swing adsorption process of  claim 1 , wherein the adsorbent bed comprises a parallel channel contactor.